Two highly unsymmetrical tetradentate (N3O) Schiff base copper(II) complexes: Template synthesis,structural characterization,magnetic and computational studies |
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| Authors: | Ambarish Ray Dipankar Maity Anup Pramanik Kalyan K Das Mahasweta Nandi Asim Bhaumik M Nethaji Swastik Mondal Monika Mukherjee Mahammad Ali |
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| Institution: | 1. Department of Chemistry, Jadavpur University, Kolkata 700 032, India;2. Department of Materials Science and Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India;3. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India;4. Solid State Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India |
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| Abstract: | Two new copper(II) complexes, Cu2(L1)2](ClO4)2 (1) and Cu(L2)(ClO4)] (2), of the highly unsymmetrical tetradentate (N3O) Schiff base ligands HL1 and HL2 (where HL1 = N-(2-hydroxyacetophenone)-bis-3-aminopropylamine and HL2 = N-(salicyldehydine)-bis-3-aminopropylamine) have been synthesised using a template method. Their single crystal X-ray structures show that in complex 1 two independent copper(II) centers are doubly bridged through phenoxo-O atoms (O1A and O1B) of the two ligands and each copper atom is five-coordinated with a distorted square pyramidal geometry. The asymmetric unit of complex 2 consists of two crystallographically independent N-(salicylidene)-bis(aminopropyl)amine-copper(II) molecules, A and B, with similar square pyramidal geometries. Cryomagnetic susceptibility measurements (5–300 K) on complex 1 reveal a distinct antiferromagnetic interaction with J = ?23.6 cm?1, which is substantiated by a DFT calculation (J = ?27.6 cm?1) using the B3LYP functional. Complex 1, immobilized over highly ordered hexagonal mesoporous silica, shows moderate catalytic activity for the epoxidation of cyclohexene and styrene in the presence of TBHP as an oxidant. |
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